fangliao-houtai/node_modules/snabbdom/build/modules/props.js

function updateProps(oldVnode, vnode) {
    let key;
    let cur;
    let old;
    const elm = vnode.elm;
    let oldProps = oldVnode.data.props;
    let props = vnode.data.props;
    if (!oldProps && !props)
        return;
    if (oldProps === props)
        return;
    oldProps = oldProps || {};
    props = props || {};
    for (key in props) {
        cur = props[key];
        old = oldProps[key];
        if (old !== cur && (key !== "value" || elm[key] !== cur)) {
            elm[key] = cur;
        }
    }
}
export const propsModule = { create: updateProps, update: updateProps };
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